Seal for instrument cases



Sept. 25, 1928.

C. T. WALLIS SEAL FOR INSTRUMENT CASES Filed April 26, 1927 vHmmennfcavm Cyril .7. WW hi4 Patented Sept. 25, 1928. 1,685,580

UNITED STATES PATENT OFFICE.

CYRIL T. WALLIS, OI ROCHESTER, NEW YORK, ASSIGNOR TO NORTH EAST ELECTRICCOMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

SEAL FOR INSTRUMENT CASES.

Application filed April 26, 1927. Serial No. 186,807.

In the manufacture of an instrument of The seal 6, as shown on a largerscale in precision, such as a speedometer, it is often Fig. 1, has theform of a pin, with a reladesirable that the case of the instrument betively wide head and a narrower cylindrical sealed in closed conditionat the factory so shank 7, and it is made of lead .or some 35 that, incase of defect in the instrument, asother soft metal. To put the seal inplace, it surance may be had that it is returned to the is necessaryonly to introduce the shank 7 factory or to an authorized repair agencyinto the perforations in the case members, without being opened andtampered with by and then drive or set the seal by means of a the user.The object of the present invention suitable punch or setting toolhammered. 40

10 is to produceaseal for the purposein question lightly against thehead of the seal. This which is simple, easy of application andimoperation causes the inner end of the shank possible to remove withoutmutilation. to be pressed against the frame member 5 To the foregoingend the invention conwith suflicient force to upset and increase insists in the seal hereinafter described, as it is diameter, as shown inFig. 2, while the head 45 defined in the annexed claim. of the seal isflattened or swaged to fit closely In the accompanying drawings, Fig. 1is a within the larger perforation in the case perspective view of aseal embodying the member 4. It is then impossible to remove presentinvention, in its original form, and the seal without mutilating it, sothat the two Fig. 2 is a sectional view, upon a smaller scale. membersof the instrument case cannot be showing the seal of Fig. 1 as appliedto the drawn apart while the seal remains intact.

case of a speedometer. The invention claimed is:

Fig. 2 of the drawings shows a partial sec- In combination with aninstrument comtional view of a speedometer case comprising prising aframe-member, enclosed within a forward and rear members 3 and 4, whichcase having two overlapping members with 55 overlapattheircontiguousportions. Enclosed coincident perforations: a sealconsisting of within this case is a rigid stationary frame soft metaland comprising a head andashank, member 5, forming a part of theinstrument. the seal being seated in said perforations and. Theoverlapping portions of the two case with the inner end of the shankupset against members have coincidental. perforations, that said framemember so that the seal cannot in the member 4 being of greater diameterbe withdrawn without mutilation.

than that in the member 3. CYRIL T. WALLIS.

